一个浏览器循环刷新网页的例子

class Program
    {
        public static void Main(string[] args)
        {
            int i=0;
            String[] urlarray = new String[] { "http://www.baidu.com/", "http://msdn.microsoft.com/", "http://www.qidian.com/Default.aspx" };
            RefreshPage repa = new RefreshPage(0, 1, urlarray, false);
            while (i < 7)
            {
                repa.Next();
                repa.FindCurrent = "No";
                i++;
            }
        }      
    }

 class RefreshPage
    {
        int CurrentPage; 
        int NextPage;
        String[] UrlArray;
        public String FindCurrent="No";
        bool Stop;
        public RefreshPage(int CurrentPage, int NextPage, String[] UrlArray, bool Stop)
        {
            this.CurrentPage = CurrentPage;
            this.NextPage = NextPage;
            this.UrlArray = UrlArray;
            this.Stop = Stop;
        }
        public void Next()
        {
            SHDocVw.ShellWindows sw = new SHDocVw.ShellWindows();
            while (FindCurrent == "No")
            {
                foreach (SHDocVw.InternetExplorer Iweb in sw)
                {

                    if (Iweb.LocationURL.StartsWith(UrlArray[CurrentPage]))
                    {
                        HTMLDocument doc2 = Iweb.Document as HTMLDocument;
                        HTMLScriptElement script = (HTMLScriptElement)doc2.createElement("script");
                        script.text = "function newDoc(url){window.location.assign(url)} t=setTimeout("newDoc(" + "'" + UrlArray[NextPage] + "'" + ")", 5000)";
                        HTMLBody body = doc2.body as HTMLBody;
                        if (body != null)
                        {
                            body.appendChild((IHTMLDOMNode)script);
                            FindCurrent = "Yes";
                        }
                        else
                            continue;
                    }
                }
            }
            CurrentPage+= 1;
            NextPage += 1;
            if (NextPage >= UrlArray.Length)
                NextPage = 0;
            if (CurrentPage >= UrlArray.Length)
                CurrentPage = 0;
            System.Console.WriteLine("current");
        }
    }

1. 首先需要引用两个dll

SHDocVw.dll

mshtml.dll

2. 本例子是按照所给出的数组，数组中存储的是将要循环访问的url，程序访问打开的网页寻找与数组的第一个url匹配的值，并且给他添加脚本，使该网页跳转到另一个url，即

数组的下一个值，使数组中所有url循环访问到。

3. 变量FindCurrent非常重要，由于浏览器打开一个网页需要时间，而程序读取确是，很快的，如果没有这个变量的判断，则代码会一直读不到当前要寻找的url。

while (FindCurrent == "No")

同理读取到当前url，但是html内容还没有load完，也无法读到html 的body，会导致一直读不到html body，下面这个判断也非常重要

if (body != null)